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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center" width=150px>Windows</td>        <td align="left">windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu16.04的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 16 Pro</td>        <td align="left">16.2.3 build-19376536</td>      </tr>    <tr>        <td align="center">SecureCRT</td>        <td align="left">Version 8.7.2 (x64 build 2214)   -   正式版-2020年5月14日</td>      </tr>    <tr>        <td align="center">开发板</td>        <td align="left">正点原子 i.MX6ULL Linux阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，NXP提供的版本为uboot-imx-rel_imx_4.1.15_2.1.0_ga(使用的uboot版本为U-Boot 2016.03)</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.15(NXP官方提供)</td>      </tr>    <tr>        <td align="center">STM32开发板</td>        <td align="left">正点原子战舰V3(STM32F103ZET6)</td>      </tr></table>
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<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <ul><li>通用</li></ul><table><tr><td align="center">分类  </td><td align="center">网址</td><td align="center">说明</td></tr><tr><td align="center" rowspan="4">官方网站</td><td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td><td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td></tr><tr>                                            <td align="left"><a href="https://www.st.com/content/st_com/zh.html" target="_blank">https://www.st.com/content/st_com/zh.html</a></td><td align="left">ST官方网站，在这里我们可以找到STM32的相关文档</td></tr><tr>                                            <td align="left"><a href="https://www.stmcu.com.cn/" target="_blank">https://www.stmcu.com.cn/</a></td><td align="left">意法半导体ST中文官方网站，在这里我们可以找到STM32的相关中文参考文档</td></tr><tr>                                            <td align="left"><a href="http://elm-chan.org/fsw/ff/00index_e.html" target="_blank">http://elm-chan.org/fsw/ff/00index_e.html</a></td><td align="left">FatFs文件系统官网</td></tr><tr><td align="center" rowspan="3">教程书籍</td><td align="left"><a href="STM32开发相关资料/01ARM参考资料/ARM Cortex-M3权威指南(中文).pdf" target="_blank">《ARM Cortex-M3权威指南》</a></td><td alirn="left" rowspan="3">ARM公司专家Joseph Yiu（姚文祥）的力作，中文翻译是NXP的宋岩</td></tr><tr>                                            <td align="left"><a href="STM32开发相关资料/01ARM参考资料/ARM Cortex-M0权威指南(中文).pdf" target="_blank">《ARM Cortex-M0权威指南》</a></td></tr><tr>                                            <td align="left"><a href="" target="_blank">《ARM Cortex-M3与Cortex-M4权威指南》</a></td></tr><tr><td align="center" rowspan="4">开发论坛</td><td align="left"><a href="http://47.111.11.73/forum.php" target="_blank">http://47.111.11.73/forum.php</a></td><td align="left">开源电子网，正点原子的资料下载及问题讨论论坛</td></tr><tr>                                            <td align="left"><a href="https://www.firebbs.cn/forum.php" target="_blank">https://www.firebbs.cn/forum.php</a></td><td align="left">国内Kinetis开发板-野火/秉火（刘火良）主持的论坛，现也做STM32和i.MX RT</td></tr><tr>                                            <td align="left"><a href="https://www.amobbs.com/index.php" target="_blank">https://www.amobbs.com/index.php</a></td><td align="left">阿莫（莫进明）主持的论坛，号称国内最早最火的电子论坛，以交流Atmel AVR系列单片机起家，现已拓展到嵌入式全平台，其STM32系列帖子有70W+。</td></tr><tr>                                            <td align="left"><a href="http://download.100ask.net/index.html" target="_blank">http://download.100ask.net/index.html</a></td><td align="left">韦东山嵌入式资料中心，有些STM32和linux的相关资料也可以来这里找。</td></tr><tr><td align="center" rowspan="3">博客参考</td><td align="left"><a href="http://www.openedv.com/" target="_blank">http://www.openedv.com/</a></td><td align="left">开源网-原子哥个人博客</td></tr><tr>                                            <td align="left"><a href="http://blog.chinaaet.com/jihceng0622" target="_blank">http://blog.chinaaet.com/jihceng0622</a></td><td align="left">博主是原Freescale现NXP的现场应用工程师</td></tr><tr>                                            <td align="left"><a href="https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/cortex-m-resources" target="_blank">cortex-m-resources</a></td><td align="left">这其实并不算是一个博客，这是ARM公司专家Joseph Yiu收集整理的所有对开发者有用的官方Cortex-M资料链接（也包含极少数外部资源链接）</td></tr></table><ul><li>STM32</li></ul><table>    <tr><td align="center" rowspan="2">STM32</td><td align="left"><a href="https://doc.embedfire.com/mcu/stm32/f103/hal_general/zh/latest/index.html" target="_blank">STM32 HAL库开发实战指南——基于F103系列开发板</a></td><td align="left">野火STM32开发教程在线文档</td></tr><tr>                                            <td align="left"><a href="https://doc.embedfire.com/mcu/stm32/f103badao/std/zh/latest/index.html" target="_blank">STM32库开发实战指南——基于野火霸道开发板</a></td><td align="left">野火STM32开发教程在线文档</td></tr></table><ul><li>SD卡</li></ul><table>    <tr><td align="left"><a href="https://www.sdcard.org/" target="_blank">SD Association</a></td><td align="left">提供了SD存储卡和SDIO卡系统规范</td></tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
              <div class='content'>
              <table>    <tr><td align="left"><a href="https://www.st.com/resource/en/datasheet/stm32f103ze.pdf" target="_blank">STM32F103xx英文数据手册</a></td><td align="left">STM32F103xC/D/E系列的英文数据手册</td></tr>    <tr><td align="left"><a href="https://www.stmcu.com.cn/Designresource/detail/localization_document%20/709978" target="_blank">STM32F103xx中文数据手册</a></td><td align="left">STM32F103xC/D/E系列的中文数据手册</td></tr>    <tr><td align="left"><a href="https://www.st.com/resource/en/reference_manual/rm0008-stm32f101xx-stm32f102xx-stm32f103xx-stm32f105xx-and-stm32f107xx-advanced-armbased-32bit-mcus-stmicroelectronics.pdf" target="_blank">STM32F10xxx英文参考手册（RM0008）</a></td><td align="left">STM32F10xxx系列的英文参考手册</td></tr>    <tr><td align="left"><a href="https://www.stmcu.com.cn/Designresource/detail/localization_document%20/710001" target="_blank">STM32F10xxx中文参考手册（RM0008）</a></td><td align="left">STM32F10xxx系列的中文参考手册</td></tr>    <tr><td align="left"><a href="https://developer.arm.com/documentation/100165/0201/?lang=en" target="_blank">Arm Cortex-M3 处理器技术参考手册-英文版</a></td><td align="left">Cortex-M3技术参考手册-英文版</td></tr>    <tr><td align="left"><a href="https://www.st.com/resource/en/programming_manual/pm0056-stm32f10xxx20xxx21xxxl1xxxx-cortexm3-programming-manual-stmicroelectronics.pdf" target="_blank">STM32F10xxx Cortex-M3编程手册-英文版(PM0056)</a></td><td align="left">STM32F10xxx/20xxx/21xxx/L1xxxx系列Cortex-M3编程手册-英文版</td></tr>    <tr><td align="left"><a href="https://www.sdcard.org/downloads/pls/" target="_blank">SD卡相关资料——最新版本</a></td><td align="left">有关SD卡的一些资料可以从这里下载</td></tr>    <tr><td align="left"><a href="https://www.sdcard.org/downloads/pls/archives/" target="_blank">SD卡相关资料——历史版本</a></td><td align="left">有关SD卡的一些历史版本资料可以从这里下载，比如后边看的SD卡2.0协议</td></tr>    <tr><td align="left"><a href="./" target="_blank">SD 2.0 协议标准完整版</a></td><td align="left">这是一篇关于SD卡2.0协议的中文文档，还是比较有参考价值的，可以一看</td></tr></table>
              </div>
            </details>

<h1 id="一、EEPROM简介"><a href="#一、EEPROM简介" class="headerlink" title="一、EEPROM简介"></a><font size=3>一、EEPROM简介</font></h1><p>EEPROM (Electrically Erasable Programmable read only memory)是指带电可擦可编程只读存储器。是一种掉电后数据不丢失的存储芯片。 EEPROM 可以在电脑上或专用设备上擦除已有信息，重新编程。一般用在即插即用。</p>
<p>我们这一节的笔记主要是关于AT24C02的使用，它是一个串行电可擦除和可编程只读存储器(EEPROM)，总容量是256（2K&#x2F;8)个字节，通过IIC通信。它是<a target="_blank" rel="noopener" href="https://www.microchip.com/en-us/tools-resources/search-discover/atmel-start">Atmel</a>公司的一款芯片，我们我使用的战舰V3的开发板上时AT24C02BN，我们可以在这里找到它的数据手册：<a target="_blank" rel="noopener" href="https://ww1.microchip.com/downloads/en/DeviceDoc/doc5126.pdf">AT24C01A&#x2F;02&#x2F;04&#x2F;08&#x2F;16 (microchip.com)</a>。</p>
<h1 id="二、AT24C02功能"><a href="#二、AT24C02功能" class="headerlink" title="二、AT24C02功能"></a><font size=3>二、AT24C02功能</font></h1><h2 id="1-框图"><a href="#1-框图" class="headerlink" title="1. 框图"></a><font size=3>1. 框图</font></h2><p>我们可以看 <a target="_blank" rel="noopener" href="https://ww1.microchip.com/downloads/en/DeviceDoc/doc5126.pdf">AT24C01A&#x2F;02&#x2F;04&#x2F;08&#x2F;16 (microchip.com)</a></p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507122145166.png" alt="image-20230507122145166" style="zoom:50%;" />

<p>引脚功能描述如下：</p>
<table>
<thead>
<tr>
<th>引脚</th>
<th>说明</th>
</tr>
</thead>
<tbody><tr>
<td>A0~A2</td>
<td>Address Input</td>
</tr>
<tr>
<td>SDA</td>
<td>Serial Data</td>
</tr>
<tr>
<td>SCL</td>
<td>Serial Clock Input</td>
</tr>
<tr>
<td>WP</td>
<td>Write Protect</td>
</tr>
<tr>
<td>VCC</td>
<td>Supply Voltage(VCC &#x3D; 1.8V to 5.5V)</td>
</tr>
<tr>
<td>GND</td>
<td>Ground</td>
</tr>
</tbody></table>
<h2 id="2-设备地址"><a href="#2-设备地址" class="headerlink" title="2. 设备地址"></a><font size=3>2. 设备地址</font></h2><p>我们知道I2C总线是通过设备地址来区分不同的设备，我们使用的AT24C02有三根地址线，它的地址是这样的：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507125856205.png" alt="image-20230507125856205" style="zoom:80%;" />

<p>A0<del>A2可以接GND（代表0）也可以接VCC（代表1），这样根据A0</del>A2的接线的不同，可以有不同的地址，比如我们把A0~A2全接地，那么设备地址就是1010000x。（我们可以看 <a target="_blank" rel="noopener" href="https://ww1.microchip.com/downloads/en/DeviceDoc/doc5126.pdf">AT24C01A&#x2F;02&#x2F;04&#x2F;08&#x2F;16 (microchip.com)</a>的 6. Device Addressing）</p>
<p>那么当我们要读数据的时候，发送的地址就是10100001 &#x3D; 0xA1，当我们要写数据的时候发送的地址就是10100000 &#x3D; 0xA0。</p>
<h2 id="3-多少页？"><a href="#3-多少页？" class="headerlink" title="3. 多少页？"></a><font size=3>3. 多少页？</font></h2><p>我们需要知道的一些信息：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">AT24C02 一共是 <span class="number">2</span>Kb = <span class="number">2048</span>/<span class="number">8B</span> = <span class="number">256B</span></span><br></pre></td></tr></table></figure>

<p>我们看芯片手册有这么一句： 8-byte Page (2K) Write Modes，也就是说，这个256B按照8字节一页的方式，被分为32页：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">AT24C02 一共是 <span class="number">256B</span>/<span class="number">8</span> = <span class="number">32</span> 页</span><br></pre></td></tr></table></figure>



<h1 id="三、读写数据"><a href="#三、读写数据" class="headerlink" title="三、读写数据"></a><font size=3>三、读写数据</font></h1><h2 id="1-写操作"><a href="#1-写操作" class="headerlink" title="1. 写操作"></a><font size=3>1. 写操作</font></h2><h3 id="1-1-BYTE-WRITE"><a href="#1-1-BYTE-WRITE" class="headerlink" title="1.1 BYTE WRITE"></a><font size=3>1.1 BYTE WRITE</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507131203330.png" alt="image-20230507131203330" style="zoom:50%;" />



<h3 id="1-2-PAGE-WRITE"><a href="#1-2-PAGE-WRITE" class="headerlink" title="1.2 PAGE WRITE"></a><font size=3>1.2 PAGE WRITE</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507131219435.png" alt="image-20230507131219435" style="zoom:50%;" />

<h2 id="2-读操作"><a href="#2-读操作" class="headerlink" title="2. 读操作"></a><font size=3>2. 读操作</font></h2><h3 id="2-1-CURRENT-ADDRESS-READ"><a href="#2-1-CURRENT-ADDRESS-READ" class="headerlink" title="2.1 CURRENT ADDRESS READ"></a><font size=3>2.1 CURRENT ADDRESS READ</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507131440446.png" alt="image-20230507131440446" style="zoom:50%;" />

<h3 id="2-2-RANDOM-READ"><a href="#2-2-RANDOM-READ" class="headerlink" title="2.2 RANDOM READ"></a><font size=3>2.2 RANDOM READ</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507131453955.png" alt="image-20230507131453955" style="zoom:50%;" />

<h3 id="2-3-SEQUENTIAL-READ"><a href="#2-3-SEQUENTIAL-READ" class="headerlink" title="2.3 SEQUENTIAL READ"></a><font size=3>2.3 SEQUENTIAL READ</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507131505419.png" alt="image-20230507131505419" style="zoom:50%;" />

<h2 id="3-怎么找到要读写的位置？"><a href="#3-怎么找到要读写的位置？" class="headerlink" title="3. 怎么找到要读写的位置？"></a><font size=3>3. 怎么找到要读写的位置？</font></h2><p>上边是读写操作的过程，那么我们在实际读写过程中，怎么确定我们要往那个地址写数据呢？AT24C02一共是2Kbit，也就是256x8bit，也就是一共256页，每一页是1字节（8位），地址在实际读写的过程中是这样的：</p>
<table>
<thead>
<tr>
<th>地址</th>
<th>数据</th>
</tr>
</thead>
<tbody><tr>
<td>0x00</td>
<td>xxxx xxxx</td>
</tr>
<tr>
<td>0x01</td>
<td>xxxx xxxx</td>
</tr>
<tr>
<td>0x02</td>
<td>xxxx xxxx</td>
</tr>
<tr>
<td>……</td>
<td>……</td>
</tr>
<tr>
<td>0xFF</td>
<td>xxxx xxxx</td>
</tr>
</tbody></table>
<h1 id="四、I2C读写实例"><a href="#四、I2C读写实例" class="headerlink" title="四、I2C读写实例"></a><font size=3>四、I2C读写实例</font></h1><h2 id="1-硬件设计"><a href="#1-硬件设计" class="headerlink" title="1. 硬件设计"></a><font size=3>1. 硬件设计</font></h2><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507133622454.png" alt="image-20230507133622454" style="zoom:50%;" />

<p>可以看到这里的AT24C02接在了PB6和PB7，也就是I2C1上边。</p>
<h2 id="2-物理I2C读写AT24C02"><a href="#2-物理I2C读写AT24C02" class="headerlink" title="2. 物理I2C读写AT24C02"></a><font size=3>2. 物理I2C读写AT24C02</font></h2><p>一般步骤如下：</p>
<p>（1）配置通讯使用的目标引脚为开漏模式；</p>
<p>（2）使能 I2C 外设的时钟；</p>
<p>（3）配置 I2C 外设的模式、地址、速率等参数并使能 I2C 外设；</p>
<p>（4）编写基本 I2C 按字节收发的函数；  </p>
<p>（5）编写读写 EEPROM 存储内容的函数；</p>
<p>（6）编写测试程序，对读写数据进行校验。  </p>
<h3 id="2-1-STM32CubeMX配置"><a href="#2-1-STM32CubeMX配置" class="headerlink" title="2.1 STM32CubeMX配置"></a><font size=3>2.1 STM32CubeMX配置</font></h3><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507134551105.png" alt="image-20230507134551105" style="zoom:50%;" />

<h3 id="2-2-宏定义"><a href="#2-2-宏定义" class="headerlink" title="2.2 宏定义"></a><font size=3>2.2 宏定义</font></h3><p>我们先来定义一些要用的宏：</p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">define</span> EEPROM_PAGESIZE  8    <span class="comment">// AT24C01/02每页有8个字节，一共是32页</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> I2C_OWN_ADDRESS7 0X0A <span class="comment">// STM32自己的地址，这个地址只要与STM32外挂的I2C器件地址不一样即可</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">/* </span></span><br><span class="line"><span class="comment"> * AT24C02 2kb = 2048bit = 2048/8 B = 256 B </span></span><br><span class="line"><span class="comment"> * 32 pages of 8 bytes each</span></span><br><span class="line"><span class="comment"> *</span></span><br><span class="line"><span class="comment"> * Device Address</span></span><br><span class="line"><span class="comment"> * 1 0 1 0 A2 A1 A0 R/W</span></span><br><span class="line"><span class="comment"> * 1 0 1 0 0  0  0  0 = 0XA0</span></span><br><span class="line"><span class="comment"> * 1 0 1 0 0  0  0  1 = 0XA1 </span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> EEPROM_ADDRESS        0xA0 <span class="comment">// AT24C02的地址（A0~A2全部接0了）</span></span></span><br></pre></td></tr></table></figure>

<h3 id="2-3-写入一个字节数据"><a href="#2-3-写入一个字节数据" class="headerlink" title="2.3 写入一个字节数据"></a><font size=3>2.3 写入一个字节数据</font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">uint32_t</span> <span class="title function_">I2C_EE_ByteWrite</span><span class="params">(<span class="type">uint8_t</span>* pBuffer, <span class="type">uint8_t</span> WriteAddr)</span></span><br><span class="line">&#123;</span><br><span class="line">	HAL_StatusTypeDef status = HAL_OK;</span><br><span class="line"></span><br><span class="line">	status = HAL_I2C_Mem_Write(&amp;I2C_Handle, EEPROM_ADDRESS, (<span class="type">uint16_t</span>)WriteAddr, I2C_MEMADD_SIZE_8BIT, pBuffer, <span class="number">1</span>, <span class="number">100</span>); </span><br><span class="line"></span><br><span class="line">	<span class="comment">/* Check the communication status */</span></span><br><span class="line">	<span class="keyword">if</span>(status != HAL_OK)</span><br><span class="line">	&#123;</span><br><span class="line">	<span class="comment">/* Execute user timeout callback */</span></span><br><span class="line">	<span class="comment">//I2Cx_Error(Addr);</span></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">while</span> (HAL_I2C_GetState(&amp;I2C_Handle) != HAL_I2C_STATE_READY);</span><br><span class="line"></span><br><span class="line">	<span class="comment">/* Check if the EEPROM is ready for a new operation */</span></span><br><span class="line">	<span class="keyword">while</span> (HAL_I2C_IsDeviceReady(&amp;I2C_Handle, EEPROM_ADDRESS, EEPROM_MAX_TRIALS, I2Cx_TIMEOUT_MAX) == HAL_TIMEOUT);</span><br><span class="line"></span><br><span class="line">	<span class="comment">/* Wait for the end of the transfer */</span></span><br><span class="line">	<span class="keyword">while</span> (HAL_I2C_GetState(&amp;I2C_Handle) != HAL_I2C_STATE_READY);</span><br><span class="line">	<span class="keyword">return</span> status;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>这里只是简单调用库函数 HAL_I2C_Mem_Write 就可以实现，通过封装一次使用更方。在这个通讯过程中， STM32 实际上通过 I2C 向 EEPROM 发送了两个数据，但为何第一个数据被解释为 EEPROM 的内存地址？这是由 EEPROM 的自己定义的单字节写入时序，见下图：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507140607977.png" alt="image-20230507140607977" style="zoom:80%;" />

<p>EEPROM 的单字节时序规定，向它写入数据的时候，第一个字节为内存地址，第二个字节是要写入的数据内容。所以我们需要理解：命令、地址的本质都是数据，对数据的解释不同，它就有了不同的功能。  </p>
<h3 id="2-4-按页写入数据"><a href="#2-4-按页写入数据" class="headerlink" title="2.4 按页写入数据"></a><font size=3>2.4 按页写入数据</font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">uint32_t</span> <span class="title function_">I2C_EE_PageWrite</span><span class="params">(<span class="type">uint8_t</span>* pBuffer, <span class="type">uint8_t</span> WriteAddr, <span class="type">uint8_t</span> NumByteToWrite)</span></span><br><span class="line">&#123;</span><br><span class="line">	HAL_StatusTypeDef status = HAL_OK;</span><br><span class="line">	<span class="comment">/* Write EEPROM_PAGESIZE */</span></span><br><span class="line">	status=HAL_I2C_Mem_Write(&amp;I2C_Handle, EEPROM_ADDRESS,WriteAddr, I2C_MEMADD_SIZE_8BIT, (<span class="type">uint8_t</span>*)(pBuffer),NumByteToWrite, <span class="number">100</span>);</span><br><span class="line"></span><br><span class="line">	<span class="keyword">while</span> (HAL_I2C_GetState(&amp;I2C_Handle) != HAL_I2C_STATE_READY);</span><br><span class="line"></span><br><span class="line">	<span class="comment">/* Check if the EEPROM is ready for a new operation */</span></span><br><span class="line">	<span class="keyword">while</span> (HAL_I2C_IsDeviceReady(&amp;I2C_Handle, EEPROM_ADDRESS, EEPROM_MAX_TRIALS, I2Cx_TIMEOUT_MAX) == HAL_TIMEOUT);</span><br><span class="line"></span><br><span class="line">	<span class="comment">/* Wait for the end of the transfer */</span></span><br><span class="line">	<span class="keyword">while</span> (HAL_I2C_GetState(&amp;I2C_Handle) != HAL_I2C_STATE_READY);</span><br><span class="line">	<span class="keyword">return</span> status;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>在以上的数据通讯中，每写入一个数据都需要向 EEPROM 发送写入的地址，我们希望向连续地址写入多个数据的时候，只要告诉 EEPROM 第一个内存地址 address1，后面的数据按次序写入到address2、 address3…这样可以节省通讯的内容，加快速度。为应对这种需求， EEPROM 定义了一种页写入时序 : </p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/01HQ%E8%AF%BE%E7%A8%8B%E4%BD%93%E7%B3%BB/LV16-STM32%E5%BC%80%E5%8F%91/LV16-19-I2C-02-%E8%AF%BB%E5%86%99EEPROM/img/image-20230507140815497.png" alt="image-20230507140815497" style="zoom:80%;" />

<p>根据页写入时序，第一个数据被解释为要写入的内存地址 address1，后续可连续发送 n 个数据，这些数据会依次写入到内存中。这段页写入函数主体跟单字节写入函数是一样的，只是它在发送数据的时候，使用 while 循环控制发送多个数据，发送完多个数据后才产生 I2C 停止信号，只要每次传输的数据小于等于 EEPROM时序规定的页大小，就能正常传输。   </p>
<h3 id="2-5-多字节数据写入"><a href="#2-5-多字节数据写入" class="headerlink" title="2.5 多字节数据写入"></a><font size=3>2.5 多字节数据写入</font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">void</span> <span class="title function_">I2C_EE_BufferWrite</span><span class="params">(<span class="type">uint8_t</span>* pBuffer, <span class="type">uint8_t</span> WriteAddr, <span class="type">uint16_t</span> NumByteToWrite)</span></span><br><span class="line">&#123;</span><br><span class="line">  <span class="type">uint8_t</span> NumOfPage = <span class="number">0</span>, NumOfSingle = <span class="number">0</span>, Addr = <span class="number">0</span>, count = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">  Addr = WriteAddr % EEPROM_PAGESIZE;</span><br><span class="line">  count = EEPROM_PAGESIZE - Addr;</span><br><span class="line">  NumOfPage =  NumByteToWrite / EEPROM_PAGESIZE;</span><br><span class="line">  NumOfSingle = NumByteToWrite % EEPROM_PAGESIZE;</span><br><span class="line"> </span><br><span class="line">  <span class="comment">/* If WriteAddr is I2C_PageSize aligned  */</span></span><br><span class="line">  <span class="keyword">if</span>(Addr == <span class="number">0</span>) </span><br><span class="line">  &#123;</span><br><span class="line">    <span class="comment">/* If NumByteToWrite &lt; I2C_PageSize */</span></span><br><span class="line">    <span class="keyword">if</span>(NumOfPage == <span class="number">0</span>) </span><br><span class="line">    &#123;</span><br><span class="line">      I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* If NumByteToWrite &gt; I2C_PageSize */</span></span><br><span class="line">    <span class="keyword">else</span>  </span><br><span class="line">    &#123;</span><br><span class="line">      <span class="keyword">while</span>(NumOfPage--)</span><br><span class="line">      &#123;</span><br><span class="line">        I2C_EE_PageWrite(pBuffer, WriteAddr, EEPROM_PAGESIZE); </span><br><span class="line">        WriteAddr +=  EEPROM_PAGESIZE;</span><br><span class="line">        pBuffer += EEPROM_PAGESIZE;</span><br><span class="line">      &#125;</span><br><span class="line"></span><br><span class="line">      <span class="keyword">if</span>(NumOfSingle!=<span class="number">0</span>)</span><br><span class="line">      &#123;</span><br><span class="line">        I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="comment">/* If WriteAddr is not I2C_PageSize aligned  */</span></span><br><span class="line">  <span class="keyword">else</span> </span><br><span class="line">  &#123;</span><br><span class="line">    <span class="comment">/* If NumByteToWrite &lt; I2C_PageSize */</span></span><br><span class="line">    <span class="keyword">if</span>(NumOfPage== <span class="number">0</span>) </span><br><span class="line">    &#123;</span><br><span class="line">      I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="comment">/* If NumByteToWrite &gt; I2C_PageSize */</span></span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">    &#123;</span><br><span class="line">      NumByteToWrite -= count;</span><br><span class="line">      NumOfPage =  NumByteToWrite / EEPROM_PAGESIZE;</span><br><span class="line">      NumOfSingle = NumByteToWrite % EEPROM_PAGESIZE;	</span><br><span class="line">      </span><br><span class="line">      <span class="keyword">if</span>(count != <span class="number">0</span>)</span><br><span class="line">      &#123;  </span><br><span class="line">        I2C_EE_PageWrite(pBuffer, WriteAddr, count);</span><br><span class="line">        WriteAddr += count;</span><br><span class="line">        pBuffer += count;</span><br><span class="line">      &#125; </span><br><span class="line">      </span><br><span class="line">      <span class="keyword">while</span>(NumOfPage--)</span><br><span class="line">      &#123;</span><br><span class="line">        I2C_EE_PageWrite(pBuffer, WriteAddr, EEPROM_PAGESIZE);</span><br><span class="line">        WriteAddr +=  EEPROM_PAGESIZE;</span><br><span class="line">        pBuffer += EEPROM_PAGESIZE;  </span><br><span class="line">      &#125;</span><br><span class="line">      <span class="keyword">if</span>(NumOfSingle != <span class="number">0</span>)</span><br><span class="line">      &#123;</span><br><span class="line">        I2C_EE_PageWrite(pBuffer, WriteAddr, NumOfSingle); </span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;  </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>多次写入数据时，利用 EEPROM 的页写入方式，避免单字节读写时候的等待。  其实它的主旨就是对输入的数据进行分页 (本型号芯片每页 8 个位)。通过“整除”计算要写入的数据 NumByteToWrite 能写满多少“完整的页”，计算得的值存储在 NumOfPage 中，但有时数据不是刚好能写满完整页的，会多一点出来，通过“求余”计算得出“不满一页的数据个数”就存储在 NumOfSingle 中。计算后通过按页传输 NumOfPage 次整页数据及最后的 NumOfSing 个数据，使用页传输，比之前的单个字节数据传输要快很多。</p>
<p>除了基本的分页传输，还要考虑首地址的问题。若首地址不是刚好对齐到页的首地址，会需要一个 count 值，用于存储从该首地址开始写满该地址所在的页，还能写多少个数据。实际传输时，先把这部分 count 个数据先写入，填满该页，然后把剩余的数据 (NumByteToWrite-count)，再重复上述求出 NumOPage 及 NumOfSingle 的过程，按页传输到 EEPROM。   </p>
<p>（1）若 writeAddress&#x3D;16，计算得 Addr&#x3D;16%8&#x3D; 0 ， count&#x3D;8-0&#x3D; 8；</p>
<p>（2）同时，若 NumOfPage&#x3D;22，计算得 NumOfPage&#x3D;22&#x2F;8&#x3D; 2， NumOfSingle&#x3D;22%8&#x3D; 6。</p>
<p>（3）数据传输情况如下表 </p>
<table>
<thead>
<tr>
<th>不影响</th>
<th>0</th>
<th>1</th>
<th>2</th>
<th>3</th>
<th>4</th>
<th>5</th>
<th>6</th>
<th>7</th>
</tr>
</thead>
<tbody><tr>
<td>不影响</td>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
<td>15</td>
</tr>
<tr>
<td>第 1 页</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
<td>21</td>
<td>22</td>
<td>23</td>
</tr>
<tr>
<td>第 2 页</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td>27</td>
<td>28</td>
<td>29</td>
<td>30</td>
<td>31</td>
</tr>
<tr>
<td>NumOfSingle&#x3D;6</td>
<td>32</td>
<td>33</td>
<td>34</td>
<td>35</td>
<td>36</td>
<td>37</td>
<td>38</td>
<td>39</td>
</tr>
</tbody></table>
<p>（4）若 writeAddress&#x3D;17，计算得 Addr&#x3D;17%8&#x3D; 1， count&#x3D;8-1&#x3D; 7；</p>
<p>（5）同时，若 NumOfPage&#x3D;22，</p>
<p>（6）先把 count 去掉，特殊处理，计算得新的 NumOfPage&#x3D;22-7&#x3D; 15</p>
<p>（7）计算得 NumOfPage&#x3D;15&#x2F;8&#x3D; 1， NumOfSingle&#x3D;15%8&#x3D; 7。</p>
<p>（8）数据传输情况如下表：</p>
<table>
<thead>
<tr>
<th>不影响</th>
<th>0</th>
<th>1</th>
<th>2</th>
<th>3</th>
<th>4</th>
<th>5</th>
<th>6</th>
<th>7</th>
</tr>
</thead>
<tbody><tr>
<td>不影响</td>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td>13</td>
<td>14</td>
<td>15</td>
</tr>
<tr>
<td>count&#x3D;7</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td>20</td>
<td>21</td>
<td>22</td>
<td>23</td>
</tr>
<tr>
<td>第 1 页</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td>27</td>
<td>28</td>
<td>29</td>
<td>30</td>
<td>31</td>
</tr>
<tr>
<td>NumOfSingle&#x3D;7</td>
<td>32</td>
<td>33</td>
<td>34</td>
<td>35</td>
<td>36</td>
<td>37</td>
<td>38</td>
<td>39</td>
</tr>
</tbody></table>
<p>EEPROM 支持的页写入只是一种加速的 I2C 的传输时序，实际上并不要求每次都以页为单位进行读写， EEPROM 是支持随机访问的 (直接读写任意一个地址)，如前面的单个字节写入。在某些存储器，如 NAND FLASH，它是必须按照 Block 写入的，例如每个 Block 为 512或 4096 字节，数据写入的最小单位是 Block，写入前都需要擦除整个 Block； NOR FLASH 则是写入前必须以 Sector&#x2F;Block 为单位擦除，然后才可以按字节写入。而我们的 EEPROM 数据写入和擦除的最小单位是“字节”而不是“页”，数据写入前不需要擦除整页。  </p>
<h3 id="2-6-读取数据"><a href="#2-6-读取数据" class="headerlink" title="2.6 读取数据"></a><font size=3>2.6 读取数据</font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="type">uint32_t</span> <span class="title function_">I2C_EE_BufferRead</span><span class="params">(<span class="type">uint8_t</span>* pBuffer, <span class="type">uint8_t</span> ReadAddr, <span class="type">uint16_t</span> NumByteToRead)</span></span><br><span class="line">&#123;</span><br><span class="line">	HAL_StatusTypeDef status = HAL_OK;</span><br><span class="line">	</span><br><span class="line">	status=HAL_I2C_Mem_Read(&amp;I2C_Handle,EEPROM_ADDRESS,ReadAddr, I2C_MEMADD_SIZE_8BIT, (<span class="type">uint8_t</span> *)pBuffer, NumByteToRead,<span class="number">1000</span>);</span><br><span class="line"></span><br><span class="line">	<span class="keyword">return</span> status;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>我们只需要确定 I2C 的地址，数据格式，数据存储指针，数据大小，超时设置就可以把想要的数据读回来。  </p>
<h3 id="2-7-测试函数"><a href="#2-7-测试函数" class="headerlink" title="2.7 测试函数"></a><font size=3>2.7 测试函数</font></h3><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">define</span>  DATA_Size			256</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span>  EEP_Firstpage      0x00</span></span><br><span class="line"><span class="type">uint8_t</span> I2c_Buf_Write[DATA_Size];</span><br><span class="line"><span class="type">uint8_t</span> I2c_Buf_Read[DATA_Size];</span><br><span class="line"></span><br><span class="line"><span class="type">uint8_t</span> <span class="title function_">I2C_Test</span><span class="params">(<span class="type">void</span>)</span></span><br><span class="line">&#123;</span><br><span class="line">	<span class="type">uint16_t</span> i;</span><br><span class="line"></span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">&quot;写入的数据\r\n&quot;</span>);</span><br><span class="line"></span><br><span class="line">	<span class="keyword">for</span> ( i=<span class="number">0</span>; i&lt;DATA_Size; i++ ) <span class="comment">//填充缓冲</span></span><br><span class="line">	&#123;   </span><br><span class="line">		I2c_Buf_Write[i] =i;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">&quot;0x%02X &quot;</span>, I2c_Buf_Write[i]);</span><br><span class="line">		<span class="keyword">if</span>(i%<span class="number">16</span> == <span class="number">15</span>)    </span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">&quot;\r\n&quot;</span>);    </span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">//将I2c_Buf_Write中顺序递增的数据写入EERPOM中 </span></span><br><span class="line">	I2C_EE_BufferWrite( I2c_Buf_Write, EEP_Firstpage, DATA_Size);</span><br><span class="line"></span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">&quot;读出的数据\r\n&quot;</span>);</span><br><span class="line">	<span class="comment">//将EEPROM读出数据顺序保持到I2c_Buf_Read中</span></span><br><span class="line">	I2C_EE_BufferRead(I2c_Buf_Read, EEP_Firstpage, DATA_Size); </span><br><span class="line">	<span class="comment">//将I2c_Buf_Read中的数据通过串口打印</span></span><br><span class="line">	<span class="keyword">for</span> (i=<span class="number">0</span>; i&lt;DATA_Size; i++)</span><br><span class="line">	&#123;	</span><br><span class="line">		<span class="keyword">if</span>(I2c_Buf_Read[i] != I2c_Buf_Write[i])</span><br><span class="line">		&#123;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">&quot;0x%02X &quot;</span>, I2c_Buf_Read[i]);</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">&quot;错误:I2C EEPROM写入与读出的数据不一致\r\n&quot;</span>);</span><br><span class="line">			<span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">&quot;0x%02X &quot;</span>, I2c_Buf_Read[i]);</span><br><span class="line">		<span class="keyword">if</span>(i%<span class="number">16</span> == <span class="number">15</span>)    </span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">&quot;\r\n&quot;</span>);</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">&quot;I2C(AT24C02)读写测试成功\r\n&quot;</span>);</span><br><span class="line">	<span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="3-模拟I2C读写AT24C02"><a href="#3-模拟I2C读写AT24C02" class="headerlink" title="3. 模拟I2C读写AT24C02"></a><font size=3>3. 模拟I2C读写AT24C02</font></h2><p>我们还可以通过模拟I2C的方式来读写，模拟方式可以看另一篇专门写通信的笔记，这里就不多写了。</p>

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